91808408 has 8 divisors (see below), whose sum is σ = 172140780. Its totient is φ = 45904200.

The previous prime is 91808407. The next prime is 91808413. The reversal of 91808408 is 80480819.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91808407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5738018 + ... + 5738033.

Almost surely, 2^91808408 is an apocalyptic number.

It is an amenable number.

91808408 is a deficient number, since it is larger than the sum of its proper divisors (80332372).

91808408 is a wasteful number, since it uses less digits than its factorization.

91808408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11476057 (or 11476053 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 91808408 is about 9581.6704180430. The cubic root of 91808408 is about 451.1221508421.

The spelling of 91808408 in words is "ninety-one million, eight hundred eight thousand, four hundred eight".